The 32-year-old had attended the Elbrook Cash & Carry charity gala dinner in Mitcham, South London, alongside the Geordie Shore star, 26, before moving on to an after-party.
Documenting their wild night out, Marnie took to her Instagram Stories to share the lip-smacking moment in the club's bathroom for all of her 3.2million to see.
Marnie said to the camera: "This is my favourite girl. I love her", before they kissed.
The duo were joined at the post-event party by Marnie's boyfriend Casey Johnson, Sophie Kasaei, Love Island's Ellie Jones and Nadia Essex.
Lauren's appearance comes after she was attacked by cruel trolls who mocked her lips and neck in her latest Instagram post.
The former Towie star came under fire once again after sharing a saucy picture on her social media just days after having her jaw fillers removed.
In the shot, Lauren is seen pouting while applying lipstick and while most of her followers praised her glam look, trolls sent her abuse.
The debacle comes after she opened up about people thinking her face is “distorted”, and claimed it’s because photographers edit her image to make her look different.
Speaking in Now! Magazine, Lauren blasted the pictures she'd recently seen of herself and said: "The photos are blurry or my face looks distorted."
After speculation about what work she'd had done, Lauren lashed out and said she'd tried nothing but facial fillers, which she'd had removed from her jaw last week.
The reality star went on to say that she's constantly asked about surgery by her fans.
She has admitted some even asked her if she had had gone to another country to "have my face done".
Lauren added: "I put up a tweet asking for the paparazzi to stop taking pictures of me. I had just had enough!
"The photos are blurry or my face looks distorted."
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